A batch of textiles from the Wuliang Five Liang periods excavated in Yumen Bijiatan was poorly preserved due to various reasons such as complex burial environment and longevity，and most of them had defects，folds，tears，contamination and other diseases. In this study，the microstructure and yarn types of the textiles were analyzed by ultra-deep field microscopy，the dye categories of the fabrics were identified by high performance liquid chromatography-mass spectrometry，and the silk proteins were analyzed by Fourier infrared spectrometry. contained a variety of anthraquinones，all from the genus Cyperus， and indigo dyes were found in all blue-green samples，whose main pigment components were indigo and indigo red； infrared corresponded to the characteristic peaks of amide Ⅰ，amide Ⅱ and amide Ⅲ bands of silk proteins，but crystallization occurred in the silk fabrics due to the destruction of silk glue during aging. In order to reflect the integrity of cultural relics and to meet the basic requirements of the exhibition，based on scientific analysis and testing，under the guidance of the basic principles and concepts of heritage conservation，the costumes were disinfected， cleaned，leveled，form restoration，reinforcement and other restoration processes for form restoration and scientific repair. After conservation and restoration，the artistic value and style characteristics of the costumes are fully reflected and basically meet the requirements of the exhibition.